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Flashcards in Transportation Deck (33)
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1

Travel demand model

1. Trip generation
2. Trip distribution
3. Modal split - division of trips by mode
4. Trip assignment - determine path

2

Urban Collectors

Provide both land access and traffic circulation with residential, commercial, and industrial areas by collecting and distributing traffic to these areas

3

Principal arterials

- Serve longer trips
- Carry the highest traffic volumes
- Carry a large percentage of the VMT on minimum mileage
- Provide minimal land access

4

Minor arterials

- Interconnect principal arterials
- Provide less mobility
- Slightly more land access
- Distribute travel to smaller areas

5

Parking demand factors

- Land and building use
- Availability of alternative modes of transportation
- Cost of parking
- Peak and periodic use factors
- Socio-economic characteristics of users
- Availability of parking spaces
- Accessibility
- Employee vs. visitor and patron parking

6

Traffic calming

1. Vertical deflection - raised intersections, speed bumps
2. Horizontal shift - chicane, S-shaped roadway, traffic circles
3. Roadway narrowing, such as traffic islands, but may result in bike/auto collisions at intersections
4. Roadway closure using barriers or pedestrian-only designation

7

Complete Streets

- Streets designed in consideration of needs of pedestrians, bicyclists, motorists, and transit riders
- Planning for sidewalks, bike lanes, travel lanes, shoulders, crosswalks, audible pedestrian signals, street trees and ground cover, and driveways and parking areas to improve safety, encourage physical activity, and reduce crime

8

Minor arterials

Described as interconnecting the principal arterials while providing less mobility and a moderate amount of land access, distributing travel to smaller areas

9

Width of a standard stall in a surface lot

8-9 feet

10

How many minutes a day does an average U.S. adult spend driving?

72

11

Standard size of a stall for a full size car in a parking structure

9 feet by 18-20 feet

12

Range of average size of large auto racing track in the U.S.

400AC to over 1,000AC

13

Cartway

The traveled portion of the street right-of-way

14

2003 study of how workers traveled to work

- 89.3% drove car
- 4.4% used public transportation
- 3.1% worked from home
- 2.7% walked
- 0.6% biked

15

Vehicle trips per unit residential

- Retirement home: 5.86
- Mobile home park: 4.81
- Apartments: 6.63
- Condos/Townhome: 10.71
- Duplexes and townhomes: 7
- Planned unit developments - 8

16

Ideal roadway design

10 foot travel lanes
8 foot parking lanes
Curb and planting strip
Total right of way = 56 feet, which is much wider than most streets

17

Street gradient minimum and maximums

0.5% to 5% with up to 8% for areas with mild winters

18

Medical center

.75-4.5 per bed

19

Residential

.2 to 2 spaces per unit

20

Hotel

.2-1.5 spaces per room

21

Office

0.5-3 per 1,000 sf of GLA

22

Industrial

0.67-3.5 per 1,000 sf of GLA

23

Shopping center

1-5 per 1,000 sf of GLA

24

Restaurant

5-25 spaces per 1,000 sf of GLA

25

LOS A

Free flow of traffic, low density

26

LOS B

Reasonably free flow, slightly restricted movement
Delays not unreasonable

27

LOS C

Stable flow, at or near free flow
Higher volumes restrict movement

28

LOS D

Approaching unstable flow, speeds slightly decreased
Lines/delays during peak hours

29

LOS E

Unstable flow, operating at capacity, delays and congestion to all motorists

30

LOS F

Demand greater than capacity
Total congestion